Have you tried the Accuphase pre driving the power section of the 500? I assume this is possible as it is on my NuVista M3; not mentioned in the manual but as they use RCA jumpers to connect the sections it is easy to do. I have the 33EV; never been able to find out exactly how it differs from the PGT. Take a look at the Sole sub chassis for the Linn if you don't have a Keel or intend to get one; very good performance for a fraction of the cost. They have a good armboard also.